The shooter, Patrick Joseph White, fired nearly 500 rounds during the shooting, the Georgia Bureau of Investigation said at a news conference Tuesday. Most of the shell casings found at the scene were from a long gun, one of the weapons White took from his father, the GBI said.

CDC personnel said it could take "weeks or even months" to replace the damaged windows and fully clean up the site.

The suspected gunman who attacked the Centers for Disease Control and Prevention's campus on Friday fired nearly 500 rounds, law enforcement said on Tuesday.